Olefin polymer and preparation method thereof

An olefin polymer,

• wherein the olefin polymer has SF of 65 or more which is calculated by the following Equation 1:
• SF=Mw/104+5/(Mw/105)*exp(ratio of increase in elongational viscosity) [Equation 1]
• in the above equation 1, Mw means a weight average molecular weight,
• the ratio of increase in elongational viscosity is a value in which the highest elongational viscosity value measured for the olefin polymer at Hencky strain rate of 1 s−1 at 170° C. using an elongational viscosity fixture attached to the ARES rheometer is divided by the elongational viscosity value of the extrapolated straight line at the time when the highest elongational viscosity value is obtained, wherein the extrapolated straight line is a straight line in which a straight line having the average slope of the section where the elongational viscosity increases steadily with time is extended to a section where the elongational viscosity increases sharply while maintaining the above average slope,
• wherein a ratio of increase in elongational viscosity is 2.5 or more and 5.0 or less,
• wherein a weight average molecular weight of the olefin polymer is 100,000 to 160,000 g/mol, and
• wherein the olefin polymer is prepared by a method comprising:
• a step of polymerizing an olefin monomer in the presence of a hybrid supported catalyst comprising a carrier, a crosslinking type transition metal compound represented by the following Chemical Formula 1 that is supported on the carrier, and a non-crosslinking type transition metal compound represented by the following Chemical Formula 2 that is supported on the carrier:
• wherein in the above Chemical Formulae 1 and 2, M1 and M2 are the same as or different from each other, and each independently represent Ti, Zr or Hf,
• X1, X2, X3 and X4 are the same as or different from each other, and each independently represent any one of halogen, a nitro group, an amido group, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an alkoxyalkyl group having 2 to 20 carbon atoms, a silyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, a sulfonate group having 1 to 20 carbon atoms, and a sulfone group having 1 to 20 carbon atoms,
• T is C, Si, Ge, Sn or Pb,
• Q1 and Q2 are the same as or different from each other, and each independently represent any one of hydrogen, halogen, an alkyl group having 1 to 20 carbon atoms, a heterocycloalkyl group having 2 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an alkoxyalkyl group having 2 to 20 carbon atoms, a carboxylate having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, and a heteroaryl group having 5 to 20 carbon atoms,
• R1 to R6 are the same as or different from each other, and each independently represent any one of hydrogen, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an alkoxyalkyl group having 2 to 20 carbon atoms, a silyl group having 1 to 20 carbon atoms, a silylalkyl group having 1 to 20 carbon atoms, a silyloxyalkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, and an aryl group having 6 to 20 carbon atoms,
• R7 to R14 are the same as or different from each other, and each independently represent any one of hydrogen, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an alkoxyalkyl group having 2 to 20 carbon atoms, a silyl group having 1 to 20 carbon atoms, a silylalkyl group having 1 to 20 carbon atoms, a silyloxyalkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, and an aryl group having 6 to 20 carbon atoms, or one or more pairs of adjacent substituents of R7 to R14 are connected with each other to form a substituted or unsubstituted aliphatic or aromatic ring, and
• R15 to R24 are the same as or different from each other, and each independently represent any one of hydrogen, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an alkoxyalkyl group having 2 to 20 carbon atoms, a silyl group having 1 to 20 carbon atoms, a silylalkyl group having 1 to 20 carbon atoms, a silyloxyalkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, and an aryl group having 6 to 20 carbon atoms, or one or more pairs of adjacent substituents of R15 to R24 are connected with each other to form a substituted or unsubstituted aliphatic or aromatic ring.